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#include <QtGui/QScrollBar>
#include <QtGui/QPainter>

#include "imageview.h"
#include "image.h"

ImageView::ImageView(int row, int col, QWidget *parent) :
    QAbstractItemView(parent),
    _row(row),
    _col(col)
{
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

    horizontalScrollBar()->setRange(0, 0);
    verticalScrollBar()->setRange(0, 0);
}

void ImageView::dataChanged(const QModelIndex &topLeft,
                          const QModelIndex &bottomRight)
{
    QAbstractItemView::dataChanged(topLeft, bottomRight);   

    if ((topLeft.row() == _row) && (topLeft.column() == _col)) {
        QModelIndex index = model()->index(_row, _col);
        if (index.isValid()) {
            QVariant variant = model()->data(index);
            if (variant.isValid()) {
                if (variant.canConvert<ColorImage>()) {
                    _image = variant.value<ColorImage>();                    
                }
                else if (variant.canConvert<GrayscaleImage>()) {
                    _image = variant.value<GrayscaleImage>();
                }
                else if (variant.canConvert<BinaryImage>()) {
                    _image = variant.value<BinaryImage>();
                }
                else if (variant.canConvert<IndexImage>()) {
                    _image = variant.value<IndexImage>();
                }
                viewport()->update();
            }
        }
    }
}

void ImageView::paintEvent(QPaintEvent *event)
{  
    if (!_image.isNull()) {
        QSize _size = viewport()->size();
        QImage image = _image.scaled(_size, Qt::KeepAspectRatio);
        int width = _size.width();
        int height = _size.height();
        int imageWidth = image.width();
        int imageHeight = image.height();
        int x = (width == 0) ? 0 : (width - imageWidth) / 2;
        int y = (height == 0) ? 0 : (height - imageHeight) / 2;
        QPainter painter(viewport());
        painter.drawImage(x, y, image);
        painter.end();
    }
}

QRect ImageView::visualRect(const QModelIndex &index) const
{
    return viewport()->rect();
}

void ImageView::scrollTo(const QModelIndex &index, ScrollHint hint)
{

}

QModelIndex ImageView::indexAt(const QPoint &point) const
{
    return QModelIndex();
}

QModelIndex ImageView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
{
    return QModelIndex();
}

int ImageView::horizontalOffset() const
{
    return horizontalScrollBar()->value();
}

int ImageView::verticalOffset() const
{
    return verticalScrollBar()->value();
}

bool ImageView::isIndexHidden(const QModelIndex & /*index*/) const
{
    return false;
}

void ImageView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
{

}

QRegion ImageView::visualRegionForSelection(const QItemSelection &selection) const
{
    return QRect();
}
